Exhaust system for internal-combustion engines



Oct. 8, 1929. D. H. WELLS 1,730,869

EXHAUST SYSTEM FOR INTERNAL COMBUSTION ENGINES Filed March 1928 Patented Oct. 8, 1929 I UNITED STATES PATENT OFFICE DAVID H. WELLS, OF FLUSHING, NEW YORK, ASSIGNOR TO INTERNATIONAL MOTOR GQMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE EXHAUST SYSTEM FOR INTERNAL-COMBUSTION ENGINES Application filed March 20, 1928.

This invention relates to mufflers for internal combustion engines and combines with an old form of niuflier, structural features which serve to reduce the exhaust noise materially, as well as to increase the rate of flow of the exhaust gases which have been bypassed for use in the carbureter vaporizer.

The main exhaust line from the manifold is introduced into the mufiler at such a point that the wave impulses from its gases will tend to destroy the wave impulses from the gases introduced into the muffler at another point by the exhaust line extending from the carbureter vaporizer. In their continued flow, and before they are exhausted, the gases from the main exhaust line are introduced into the mufller and pass into a final exhaust pipe, the suction resultingfrom such flow inducing a more rapid flow of gases through the auxiliary exhaust line from the vaporizer. The exhaust from the body heaters may also be introduced into the mufller and in such case afford a further destructive influence on the wave impulses as well as increase the suction in the auxiliary exhaust line.

The preferred mufiler construction and exhaust connections will be described more fully in connection with the embodiment shown in the accompanying drawings,

wherein Figure 1 is an elevation of a vehicle chassis provided with a muffler and exhaust connections in accordance with the present in vention.

Figure 2 is a view in section, taken on line 22 of Figure 1 and looking in the direction of the arrows.

A conventional vehicle chassis provided with an internal combustion engine is indicated at a. The exhaust manifold of the engine is shown at b and is provided with a bleed pipe 5 for carrying a portion of the exhaust gases to the carbureter vaporizer 0 from the vaporizer. Auxiliary exhaust line P 0 carries the exhaust gases to the mufiler d.

Serial No. 263,160.

The main exhaust line carrying gases from the manifold Z) to the muilier (Z is shown at b and, as indicated in Figure 2, extends within the muilier for a considerable distance. The gases issuing from the main exhaust pipe 6 are bai'l'led at the end of the mu'liler and their direction of travel is reversed in order that they may pass through the pipe 0 which exhausts them to the atmosphere. An opening is formed at f, it being between the end 0 of the auxiliary exhaust pipe 0 and the mouth 6 of the pipe 6. The arrows within the muffler indicate the flow of the main exhaust gases. Pipe 6 carries the exhaust gases from all of the exhaust lines to the atmosphere through the flare 6 A connection for the cylinder exhaust may be made at g and the gases from this exhaust contribute to the quantity passing through the opening f resulting in a greater suction created within the nozzle 0 It will be apparent that the suction created at the end of the auxiliary exhaust pipe 0 materially increases the flow of exhaust gases therethrough and improves the vaporizing efiect of the carbureter vaporizer 0. In addition to this effect, the plurality of streams of exhaust gases through the several pipes have different velocities, the velocity of the main exhaust stream being the highest. Considered as wave impulses these gases have different frequencies and being out of phase with each other tend to destroy the wave impulses which ordinarily result in the noise of the exhaust transmitted from the metallic parts. This results in a quieter mui'ller action and provides a far more desirable operation of the engine.

Although the invention has been described in connection with the specific showing of the accompanying drawings, it is not to be limited save as defined in the appended claim.

I claim as my invention:

An exhaust system including a main exhaust line, an auxiliary exhaust line, a muffler having an inlet and a discharge end, the lines being connected to the inlet end independently, one of the lines extending in proximity to the discharge end of the muffler, an outlet pipe extending Within the Inufiler, in proximity to the inlet end there- OI", and mounted in proximity to the end of the auxiliary pipe, whereby the flow of gases between the ends of the pipes Will cause an increase in the flew through the auxiliary pipe and the noise of the explosions in the niufi er deadened.

This specification signed this 15th day of 15 March, A. D. 1928.

DAVID H. WELLS. 

